.head{
    position:fixed;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #eee;
    width:100%;
    background-color:#303030;
    z-index:100;

}
ul,li{
    display: inline-block;
}
.logo_box{
    width:100px;
    display: inline-block;
    text-align:center;
    line-height: 60px;
}
.menu a,.logo_box a{
    display: inline-block;
    height:45px;
    color:#ddd;
}
.menu{
    position: absolute;
    right:20px;
}
.menu li{
    margin-left:15px;
}
.logo_box a{
    font-size: 34px;
    font-weight: bold;
    color: #00bff3;
    padding: 0px 15px;
    line-height: 45px;
    cursor: pointer;
}
.menu a:hover{
    color: white;
}

.m_menu{
    position:fixed;
    display:none;
}

@media only screen and (max-width: 768px) {
    .menu li{
        display:none;
    }
    .menu .m_show{
        display:block;
    }

    .logo_box{
        display:inline-block;
    }

    .head{
        text-align:center;
    }

    .m_menu{

        top:0;
        left:0;
        display:block;
        width:50px;
        height:50px;
        padding-top: 6px;
    }
    .m_menu img{
        width:30px;
    }

}